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Finding the Fourth Proportional to 217.96, 300.80 and 119.72

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Solution

The fourth proportional to 217.96, 300.80 and 119.72 is: 165.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.96 : 300.80 = 119.72 : x
  2. Step 2: Convert to fraction form
    217.96/300.80 = 119.72/x
  3. Step 3: Cross multiply
    217.96x = 300.80 × 119.72
  4. Step 4: Simplify right side
    217.96x = 36,011.78
  5. Step 5: Solve for x
    x = 36,011.78/217.96
  6. Step 6: Final answer
    x = 165.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.